Sex positions while pregnant

I'm 21 and half pregnant my belly is pretty big and this morning sex was a little uncomfortable with hubby today. My hips are difficult to move when I'm top then the gravity of the belly pulls me forward, I feel my center of balance is off and I keep shifting my weight during the heat of the moment losing my momentum lol. So question to all you pregnant moms, what sex positions do you find work for during pregnancy? I'm tired of doggy position so something other than that would be great!